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Add update-only mode for test dataset generator

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Add support for running content updates against an existing migration
test dataset without recreating the filesystem structure.

Also make ACL/xattr updates non-fatal on filesystems that do not
support those operations.
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anthony.wen
2026-04-21 13:21:22 -04:00
parent 4275956259
commit 7c27535e2a
3 changed files with 42 additions and 17 deletions
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cdssync/migration-test-manifest.md
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@@ -7,12 +7,14 @@ The generator script can also run in continuous update mode after initial creati
- omit the interval argument to create the dataset once and exit
- use `0` for continuous rewrites with no sleep between passes
- use any integer greater than `0` to rewrite mutable files every `N` seconds
- use `--update-only` to run updates against an already-existing dataset without recreating the special-case filesystem objects first
Important implementation detail for update mode:
- the update loop rewrites content-bearing regular files that are intended to simulate active data churn
- it does not rewrite script files, sparse files, symlinks, hard links, or empty files
- this preserves the special-case filesystem structure while still generating ongoing content changes
- if ACL/xattr assignment is unsupported on the target filesystem, the script logs that condition and continues
## Recommended Root Layout